It's best to take the hose off, fill with muriatic acid, soak, and then beat the devil out of it. The problem with leaving it on is that the deposits sometimes will break up and then jam. This happened to me last year and I had to bite the bullet, take the hose off and clear the jam with my pole spear. If it's an old hose I would replace it.
Toronto in summer, Bahamas in winter.
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